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Implementation & Configuration Flashcards

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  1. Which ordering service type is recommended for production in Fabric 2.x?

    Answer: etcdraft

    Raft (etcdraft) is the crash-fault-tolerant production consensus; Solo is dev-only and Kafka is deprecated.

  2. How many orderer node failures can a 5-node Raft cluster tolerate while still making progress?

    Answer: 2

    Raft needs a majority quorum, so 5 nodes tolerate (5-1)/2 = 2 failures.

  3. Which file defines private data collections when committing chaincode?

    Answer: collections_config.json

    A collections config JSON is passed with --collections-config at approve and commit time.

  4. Which Fabric CA client command obtains an enrollment certificate for an already registered identity?

    Answer: fabric-ca-client enroll

    Enroll exchanges the enrollment ID and secret for a signed certificate and key.

  5. What does setting clientAuthRequired to true in TLS configuration enforce?

    Answer: Mutual TLS where clients must present certificates

    Client authentication makes TLS mutual, so the server verifies the client's certificate.

  6. What does chaincode-as-a-service (external chaincode) require the peer to be given?

    Answer: A connection.json with the chaincode server address

    The external builder package includes connection.json telling the peer where the running chaincode server listens.

  7. Which tool lets an orderer join a channel without a system channel in Fabric 2.3+?

    Answer: osnadmin channel join

    The osnadmin CLI uses the channel participation API to join orderers to application channels.

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Sources & references

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  1. blockchaintrainingalliance.com — Test delivery, passing score, score release, test dates, fees, exam format, time limit · verified Oct 2026